| Nanoscale metals localized possess surface plasmonic resonance(LSPR)in the visible range due to high charge density of the metal.Slightly decrease of the charge density moves the resonance wavelength to near-or mid-infrared,as seen in cases of some conducting metal oxide and doped semiconductors.We propose a new strategy of encapsulating gold nanorods(AuNRs)with conducting Ruthenium oxide to achieve lowered effective charge density of gold as well as the LSPR in the near-infrared range.Specific contents are as follows:(1)The synthetic approach is based on the hydrolysis of Ruthenium(Ⅲ)acetylacetonate(Ru(acac)3)in an autoclave in presence of cetyltrimethylammo ni um bromide(CTAB).The reaction conditions including reaction temperature,time,pH,CTAB concentration,and the amount of Ru(acac)3 were investigated systematically in this work.(2)Electromagnetic simulations using finite element method(FEM)were performed to understand the optical responses of the core-shell structures.The influence of ruthenium oxide shell with different thickness on the extinction,absorption and scattering cross sections of core-shell structure is analyzed.(3)The broadband near-infrared response featured by the resultant AuNR@RuO2 core-shell structure implies that it can be used for high-performance energy-conserving windows of automobiles or houses.We therefore demonstrate that polymer films embedded with the core-shell structures are of high energy-conservation features with both decent transmittance of the visible light and high rejection of the near infrared light. |
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